Horticultural support



FIG. 1 is a front perspective view of a horticultural support, with environmental subject matter shown in broken line and forming no part of the claimed design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof; and,

FIG. 5 is a bottom view thereof. 

The ornamental design for a horticultural support, as shown and described. 